8T5Y

Structure of Rhodococcus sp. USK13 DarR(K44A)-cAMP complex

8T5Y の概要

• エントリーDOI: 10.2210/pdb8t5y/pdb
• 分子名称: DarR, ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE (3 entities in total)
• 機能のキーワード: camp, darr, mycobacteria, tetr, tfr, transcription
• 由来する生物種: Rhodococcus sp. USK13
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 23737.53

構造登録者

Schumacher, M.A. (登録日: 2023-06-14, 公開日: 2023-11-01, 最終更新日: 2023-11-22)

主引用文献

Schumacher, M.A.,Lent, N.,Chen, V.B.,Salinas, R.
Structures of the DarR transcription regulator reveal unique modes of second messenger and DNA binding.
Nat Commun, 14:7239-7239, 2023

PubMed Abstract: The mycobacterial repressor, DarR, a TetR family regulator (TFR), was the first transcription regulator shown to bind c-di-AMP. However, the molecular basis for this interaction and the mechanism involved in DNA binding by DarR remain unknown. Here we describe DarR-c-di-AMP and DarR-DNA structures and complementary biochemical assays. The DarR-c-di-AMP structure reveals a unique effector binding site for a TFR, located between DarR dimer subunits. Strikingly, we show this motif also binds cAMP. The location of the adenine nucleotide binding site between subunits suggests this interaction may facilitate dimerization and hence DNA binding. Indeed, biochemical assays show cAMP enhances DarR DNA binding. Finally, DarR-DNA structures reveal a distinct TFR DNA-binding mechanism involving two interacting dimers on the DNA. Thus, the combined data unveil a newly described second messenger binding motif and DNA binding mode for this important family of regulators.

PubMed: 37945601
DOI: 10.1038/s41467-023-42823-0

実験手法

X-RAY DIFFRACTION (1.44 Å)